Customers on the platform to fill three trains

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In a subway station, there are exactly enough customers on the platform to fill three trains. The arrival time of the nth train is X₁ + ··· + X_n where X₁, X₂,... are iid exponential random variables with E[Xi] = 2 minutes. Let W equal the time required to serve the waiting customers. Find P[W > 20].

Reference no: EM131084321

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